I'm not sure how you're using yours.
My WiFi is always off, my Bluetooth is always on.
I leave the screen light at 30% all the time so I don't have to bother with it.
The number of times I have had a battery <20% I can count on one hand.
I don't have a fixed charging spot, only when I'm connected to the PC.
Your device could be "phoning home" too much.
Try with WiFi off.
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